<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/ -->
<html>
  <head>
    <style>
    .flexContainer {
      display: flex;
      flex-direction: column;
      border: 2px dotted black;
      height: 298px;
    }
    .multicol {
      height: 100px;
      width: 200px;
      -moz-column-width: 20px;
      -moz-column-fill: auto;
      border: 4px solid orange;
    }
    </style>
  </head>
  <body>
    <div class="multicol">
      <div class="flexContainer">
      </div>
    </div>
  </body>
</html>
